Your Vote Counts! *Please check the meeting materials for any special requirements for meeting attendance. Smartphone users Point your camera here and vote without entering a control number For complete information and to vote, visit www.ProxyVote.com Control # V37734-P05316-Z86928-Z86927 NORTHFIELD BANCORP, INC. 2024 Annual Meeting Vote by May 21, 2024 11:59 PM ET. For shares held in a Plan, vote by May 16, 2024 11:59 PM ET. You invested in NORTHFIELD BANCORP, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on May 22, 2024. Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 8, 2024. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. Vote Virtually at the Meeting* May 22, 2024 10:00 a.m. Eastern Time Virtually at: www.virtualshareholdermeeting.com/NFBK2024 NORTHFIELD BANCORP, INC. C/O BROADRIDGE P.O. BOX 1342 BRENTWOOD, NY 11717